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IP AMaths Notes (Upper Sec, Year 3-4): 16) Applications of Differentiation

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Tangents, normals, stationary points, and related rates in IP AMaths.

Last updated 30 Nov 2025

Marcus Pang
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Marcus Pang·Managing Director (Maths)

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  1. Start Here
  2. 1 Common tasks
  3. 2 Worked example - Tangent and normal
  4. 3 Worked example - Optimisation
Q: What does IP AMaths Notes (Upper Sec, Year 3-4): 16) Applications of Differentiation cover?
A: Tangents, normals, stationary points, and related rates in IP AMaths.

Apply derivatives to describe gradient, optimise functions, and connect rates.

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Applications here match the SEAB GCE O-Level Additional Mathematics (4049) requirements: tangents/normals, stationary points with second-derivative tests or sign charts, simple optimisation, and related rates in radians.

Status: SEAB O-Level Additional Mathematics 4049 syllabus (exams from 2025) checked 2025-11-30 - scope unchanged; remains the reference for this note.

Start Here

Read timeWhat to take away
1 secondApplications of differentiation turn gradients into decisions.
10 secondsUse derivatives to find tangent gradients, normal gradients, stationary points, and related rates. Always classify stationary points before naming a maximum or minimum.
100 secondsExample: if y' = 0 at x = 3, test the second derivative or a sign chart before calling it a turning point. If y'' is positive, it is a local minimum.

1 Common tasks

  • Tangent gradient at x=a x = a

Sources

  1. SEAB GCE O-Level Additional Mathematics (4049) syllabus (examinations from 2025)